Download full-text PDF Read full-text Download citation Copy link Link copied Read full-text Download citation Copy link Link copied Citations (20) References (46) Figures (6) Abstract and Figures The present study focuses on the determination and abundance of trace metals (viz.Cu, Ni, Zn, Cr, Co, Cd, Mn and Fe) in the surficial sediments of west coast of Arabian Sea along the Indian subcontinent.Sediment samples were collected from three transects along the western continental shelf of Arabian Sea.
![]() Inurlhtm Html Php Intitle: Index Of . Chemistry Download Citation CopyThe enrichment of Fe and Mn in coastal oxic-sediments indicates the precipitation of these redox sensitive elements as Fe- and Mn-hydroxides and oxides, whereas the low Fe and Mn concentrations in the oxygen deficient sediments of deeper stations reflects the dissolution of their hydroxides and oxides. Concentrations of fairly redox insensitive trace metals like Cu, Ni, Zn, Cr and Cd (with the exceptions of Cr) showed higher values at nearshore sediments, then it decreased towards seaward and again showed a slight increase at oxygen minimum stations in all the three transects. This geochemical variability in their distributional characteristics is mainly associated with the extent to which the precipitation or dissolution of Fe- and Mn-oxideshydroxides occur since the scavenging or releasing effects of Fe- and Mn-oxideshydroxides act as significant sinks or sources of heavy metals. The change in wind pattern, coastal upwelling and increased productivity are also the reported factors which influence the biogeochemical cycling of trace metals in the surface sediments of west coast of India. Enrichment factor generally showed a high gradient accumulation from nearshore to shelf. Location of 12 sampling stations along the 3 transects from the western continental shelf of Arabian Sea.. Sample location and analysis of primary parameters. Surface sediment concentrations of Fe and Mn at 12 stations along the 3 transects from the western continental shelf of Arabian Sea (each value is an average of quadruplet sample analysis).. Enrichment factor (EF) of metals analysed a in the sediments of western continental shelf of Arabian Sea. Correlation of trace metals in surficial sediments with temperature and dissolved oxygen (n 12, and each reported value is a weighted average of quadruplet sample analyses). Figures - uploaded by Laluraj C M Author content All figure content in this area was uploaded by Laluraj C M Content may be subject to copyright. Inurlhtm Html Php Intitle: Index Of . Chemistry For Free Public FullDiscover the worlds research 17 million members 135 million publications 700k research projects Join for free Public Full-text 1 Content uploaded by Laluraj C M Author content All content in this area was uploaded by Laluraj C M on Apr 24, 2014 Content may be subject to copyright. Cu, Ni, Zn, Cr, Co, Cd, Mn and Fe) in the surci al sediments of west coast of Arabian Sea along the Indian subco ntinent. Sediment samples were colle cted from three transe cts along the western contine ntal shelf of Arabian Sea. The enrichment of Fe and Mn in coastal oxic-sediments indicates the precipitation of these redox sensitive elements as Fe- and M n-hydroxides and oxides, whereas the low Fe and Mn concentrations in the oxygen decient sediments of deeper stations reect s the dissolution of their hydroxides and oxides. Concentratio ns of fairly redox insens itive trace metals like Cu, Ni, Zn, Cr and Cd (with the exceptions of Cr) showed higher values at nearshore sediments, then it decreased towards seaward and again showed a slight increase at oxygen minimum stations in all the three transects. This geo chemical variability in their distributional characteristics is mainly associated with the extent to which the precipitat ion or dissolu tion of Fe- and Mn-oxideshydroxides occur since the scavenging or releasing eects of Fe- and Mn-oxideshydroxides act as signicant sink s or sources of heavy metals. The change in wind pattern, coastal upwel ling and increased productivity are also the reported factors which inuence the biogeochem ical cycling of trace metals in the surface sediments of west coast of India. Enrichme nt factor generally showed a high gradient accumulation from nearshore to shelf. Introduction The determination of trace metals in recently deposited sediments is a useful tool in the assess- ment of status of environmental pollution as the surcial sedim ents are potentially good indica tors of the quality of overlying waters (Berrow 1991). Once trace metals were dischar ged into coastal waters, they rapidly become associated with par- ticulates and are incorporated in bottom sedimen ts (Forstner Wittmann 1983; Hansen et al. The trace metals associated with sediments are not essentially sheltered permanently, and under changing environmental cond itions they may be released to the water c olumn by various processes of remobilisati on. Thus in aquatic system, sedi- ments may be both a carrier and a possible source of meta ls. The present study focuses on the determination and abundance of trace metals (viz. Cu, Ni, Zn, Cr, Co, Cd, Mn a nd Fe) in the surcial sedi- ments of west coast of Arabi an Sea along the Indian subcontinent.
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